Hi,
It seems that a \change command after a beam makes the Beam grob's 'positions' attribute relate to the staff changed to, instead of the staff where the beamed notes actually are.
Here's an example:
\version "2.4.2"
RH = \relative c' {
\time 12/8
\stemDown
\once \override Beam #'positions = #'(-6 . -4)
c8 d e
\once \override Beam #'positions = #'(-6 . -4)
c d e \change Staff=LH
s2.
}LH = \relative c' {
\clef bass
s2. \change Staff=RH
\stemDown
\once \override Beam #'positions = #'(-6 . -4)
c8 d e
\once \override Beam #'positions = #'(-6 . -4)
c d e \change Staff=LH
}\score {
\new PianoStaff <<
\context Staff = RH {
\RH
}
\context Staff = LH {
\LH
}
>>
}
Yuval
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